*{
	margin: 0;
	padding: 0;
	font-family: "微软雅黑";
}
a{
	text-decoration: none;
	color: black;
}
li{
	list-style: none;
}
html,body{
	width: 100%;
	height: 100%;
	background-color: #DDDDDD;
}
.subm{
			width: 100px; 
			height: 50px; 
			font-size: 18px;
		}